Utilise the vector version for sinh and cosh (UnaryOpsKernel) (#36396)
Summary:
Utilise the existing methods of `Vec256` class.
Not sure if there should be tests and if yes where.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/36396
Differential Revision: D22155803
Pulled By: VitalyFedyunin
fbshipit-source-id: 500dcb5c79650bc5daa0c9683d65eeab6f9dd1d3
